Steel ER110S-1 PWHT
Heat-treated state
UNS K21015
PWHT = post-weld heat treated
Choose when code or thick-section restraint demands stress relief; strength drops slightly while ductility and toughness improve.
Values for the PWHT condition
Other ER110S-1 tempers and conditions
ER110S-1 is listed in 2 conditions; see the grade overview at ER110S-1.
- PWHT
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHTThis page Post-weld heat treated | Choose when code or thick-section restraint demands stress relief; strength drops slightly while ductility and toughness improve. | 690 | 780 | 21 | 21 HRC | 8 % IACS |
AWDefault As-welded deposit | Standard condition for GMAW/GTAW joints in Q&T high-strength steel where 110 ksi weld strength and low-temperature toughness are required without PWHT. | 730 | 815 | 19 | 24 HRC | — |
What is ER110S-1 PWHT?
ER110S-1 PWHT is ER110S-1 heat treated to PWHT — choose when code or thick-section restraint demands stress relief; strength drops slightly while ductility and toughness improve. ER110S-1 PWHT has a yield strength of 690 MPa (100 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 80% of steel grades. Elongation at break is 21% and the elastic modulus is 205 GPa (29.7 Msi). ER110S-1 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). AW is the default condition FabDigit quotes; PWHT is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Readily welded — 84/100, better than 82% of steel grades
- High strength — 690 MPa (100 ksi), better than 80% of steel grades
ER110S-1 PWHT properties
Typical room-temperature values for ER110S-1 PWHT; 23 are specific to this condition. Other listed values are ER110S-1 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
ER110S-1 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical15
ER110S-1 PWHT has a yield strength of 690 MPa (100 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 80% of steel grades. Elongation at break is 21% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
ER110S-1 PWHT is rated for continuous service to 425°C (797 °F). It conducts heat at 39 W/m·K (22.5 BTU/hr·ft·°F), worse than 67% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
ER110S-1 PWHT conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of ER110S-1 PWHT takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
ER110S-1 PWHT's machinability is fair (47/100, worse than 58% of steel grades); weldability very good (84/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER110S-1 PWHT
Is ER110S-1 easy to machine?
Weld deposit machines like a 700–800 MPa Q&T low-alloy steel — use carbide, moderate speeds and rigid setups; expect hardness spikes near the fusion line.
Can ER110S-1 be welded?
Run GMAW with Ar + 5–25 % CO₂ (or Ar-2%O₂) or GTAW with pure Ar; keep hydrogen low, preheat/interpass per steel thickness (typically 100–150 °C) and limit heat input to ~2.0 kJ/mm to protect toughness.
Can ER110S-1 be formed, bent or molded?
Supplied as copper-coated drawn wire on layer-wound spools; ensure smooth liner and correct drive-roll pressure to avoid coating flake and birdnesting.
What surface finishes work on ER110S-1?
Weld metal rusts like carbon steel — grind, blast and apply zinc-rich primer/paint or metallize; no anodizing possible.
ER110S-1 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | ≤ 0.1 | 0.08 |
| Mn | 1.4 – 1.8 | 1.6 |
| Si | 0.2 – 0.55 | 0.4 |
| P | ≤ 0.01 | 0.01 |
| S | ≤ 0.01 | 0.01 |
| Ni | 1.9 – 2.6 | 2.2 |
| Cr | ≤ 0.5 | 0.25 |
| Mo | 0.25 – 0.55 | 0.4 |
| V | ≤ 0.04 | 0.01 |
| TiTi+Zr+Al total restricted | ≤ 0.1 | 0.03 |
| Zr | ≤ 0.1 | 0.02 |
| Al | ≤ 0.1 | 0.03 |
| Cuincludes any copper coating | ≤ 0.25 | 0.1 |
| Fe | balance | — |
ER110S-1 PWHT — frequently asked
What is ER110S-1 PWHT used for?
ER110S-1 PWHT is typically used for HY-110 steel welding, high-strength ship hull structures, heavy crane and mining equipment and military vehicle fabrication. In short: highest strength in family; matches HY-110 plate; demands strict heat-input control.
What is the yield strength of ER110S-1 PWHT?
ER110S-1 PWHT has a typical yield strength of 690 MPa (100 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 80% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is ER110S-1 PWHT easy to machine?
Reasonably — machinability is rated fair (47/100, worse than 58% of steel grades). Weld deposit machines like a 700–800 MPa Q&T low-alloy steel — use carbide, moderate speeds and rigid setups; expect hardness spikes near the fusion line.
Can ER110S-1 PWHT be welded?
Yes — weldability is rated very good (84/100). Run GMAW with Ar + 5–25 % CO₂ (or Ar-2%O₂) or GTAW with pure Ar; keep hydrogen low, preheat/interpass per steel thickness (typically 100–150 °C) and limit heat input to ~2.0 kJ/mm to protect toughness.
What surface finishes work on ER110S-1 PWHT?
Weld metal rusts like carbon steel — grind, blast and apply zinc-rich primer/paint or metallize; no anodizing possible.
Can ER110S-1 PWHT be formed, bent or molded?
Supplied as copper-coated drawn wire on layer-wound spools; ensure smooth liner and correct drive-roll pressure to avoid coating flake and birdnesting.
What is the maximum service temperature of ER110S-1 PWHT?
ER110S-1 PWHT is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER110S-1-AW and ER110S-1 PWHT?
AW is the default condition — standard condition for GMAW/GTAW joints in Q&T high-strength steel where 110 ksi weld strength and low-temperature toughness are required without PWHT. PWHT: choose when code or thick-section restraint demands stress relief; strength drops slightly while ductility and toughness improve. Yield strength is 730 MPa in AW versus 690 MPa in PWHT.
Sources
- AWS A5.28/A5.28M — Low-Alloy Steel Electrodes and Rods for Gas Shielded Arc Welding — American Welding Society (2020)
- ASME BPVC Section II Part C, SFA-5.28 — ASME (2023)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- High-strength solid wire datasheets (Lincoln Electric, ESAB, voestalpine Böhler Welding) — various (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.